You could also do two RC filters separated by a cathode follower buffer to isolate the two. If you're using the early 70's circuit half of V2 is available.
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2nd order high pass filter for tube bass amp
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Hi...I just bought myself some 400uF caps to use as first order 50Hz high pass filters. I chose 50Hz so the 100-70Hz range wouldn't be too rolled off. If it doesn't work, looks like I am going to jump right in to electronic design and build myself some active second order crossovers. Unless my ears can't tell the difference between non-polarized electrolytic caps and metal polypropylene caps.
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